Alarm-clock



ALARM SILENT i I l f J. S. HARTLEY.

ALARM CLOCK.

APPLICATION FILED DEC. 18. ms.

1,369,427. Patented Feb. 22,1921.

3 SHEETS-SHEET l- J. S. HARTLEY.

ALARM CLOCK, APPLICATION FILED DEC. 18' I916- 1,369,427, Patentd Feb. 22, 1921.

3 SHEETS-SHEET 2- UNITED STATES PATENT OFFICE.

OOIPAI G'Y, A CORPORATION 01' IASSAOEUSET'IS.

nan-omen 7 '0 all whom it may concern: Be it known that I, JOHN S. Han'rnnna citizen of the United States, residing at L nn, in ,the county of Essex and State of assachusetts, have invented a new and useful Improvement in Alarm-Clocks, of which the following is a specification.

The present invention. relates to clocks, and more articularly to alarm clocks having, in ad 1tion to the usual time-controlled alarm-rin ing devices, mechanism for ringing)the a arm in case of fire.

ne object of the present invention is to provide a novel construction and arrangement of the devices for ringing the alarm in case of fire, or other increase in temperature, whereby the prompt and reliable ringing of the alarm at a predetermined temperature is insured.

To the accomplishment of this object, and

such others as may hereinafter appear, the

- ried by a .pair of features of the invention relate to certain devices, combinations and arran ements of arts, hereinafter described an then set orth broadly and in detail in the ap ended claims, which possess advantages rea ily apparent to those skilled in the art.

The various features of the present invention will be readily understood from an inspection of the accompanying drawings illustrating the invention in its best form at present known to the inventor, in which,

Figure 1 is a right side elevation, partly in section, of the alarm clock;

Fig. 2 is a front elevation of the movement plates and the parts carried thereby;

Fig. 3 is a sectional detail of the balance wheel, hair spring-and balance stafi Fig. 4 is a rear elevation of the clock;

Fig. 5 is a sectional plan on the line 55,

ig. 6 is a sectional elevation on the line 6-6, Fig. 2-

Fig. 7 is a detail showing the dperation of p the automatic shut-off for the time-controlled alarm-ringing mechanism; and

Fig. 8 is a detail partly in section, of one of the winding arbors and the parts supported thereby.

In the illustrated embodiment of the invention the escapement of the clock is car- (plates 1 and 2 (Fig. 5) which are connecte together by three posts 3. One end of each post is staked to the plate 1. The other end .of each post 15 3 and 5 These staffs to plate 2 to the post 3. The plates 1 and 2 support all the staffs or arbors of the escapement comprising the escape wheel staff 5, the second hand or fourth wheel staff 6, and the third wheel stafl. 7. The plates 1 and 2 also sup ort the balance wheel staif 8 (Figs. ther with the ver 9 com ose' the escapement all of which is carried y the plates 1 and 2.

Specification ot Letten Patent. Patented Feb. 22, 1921 I Application am Member 1a, 1910. Serial no. 187,659.

The balance stafi 8 is constructed of nee- 11 (Fig. 5) carried respectively by the plates 1 and 2.

Frictionally mounted on the balance stafi' 8 is a sleeve 12 (Fig. 3) which supports the balance wheel 13 and hair spring collet 14. The hair s ring 15 is regulated by .a regulator 16 ig. 5) pivoted on the terminal screw 11. With this construction the balance stafl 8 maybe removed from the clock for inspection, substitution or repair without the removal of the hair spring collet and balance wheel. All that'is required to remove the balance staff is to free one end of the balance staff from one of the terminal screws and tip the balance stafi upwardly into a position convenient for the application of a pair of pliers thereto. The balance wheel may then be withdrawn from the sleeve 12 without disconnecting the hair spring from the hair spring collet.

Thev support for theescapement comprising the connected plates 1 and 2 is sup-' ported by a plate 17 (Fig. 5) forming the back plate for the movement. To this end the posts 3 are elongated to extend through holes formed in the plate 17 and the ends of the posts 3 are threaded to receive nuts 18 for securing the support for the escapement to the plate 17. he plate 17 is connected to the front movement plate19 by each of which is threaded to receive a nut 21 for securing the plate 17 to the posts.

With thisconstruction the entire escapement may be removed as a unit while the movement plates remain connected. Furthermore the back plate 17 may be removed from the posts 20 to permit the removal or insertion of the alarm and time train springs without necessitating a change in the assembly of the esca einent.

The staff 7 ig. 5) of the escapement carries a pinion 22 which meshes wlth the center wheel 23 (Figs. 2 and 5) on an arbor 24 (Fig. 2) journaled in the plates 17 and 19. The arbor 24 carries the usual lantern pinion (not shown) which meshes with the mam gear wheel 25 supported from a winding arbor 26 (Fig. 8) journaled in the plates 17 and I9. I

The winding arbor 26 carries the time train spring 27 one end of which is connected to the winding arbor and the other end of which is looped on one of the posts 20. In order to efi ect an economy in the manufacture of 010016 the windin arbor 1s knurled as shown at 28 (Fig. 8 and upon this knurled portion of the arbor a collet is secured at one end to 29 is forced. A'shoulder 30 is then formed on the collet by the same machine which forces the collet on the arbor. The shoulder 30 .forms a seat for the main gear 25 and this gear is held in place on the shoulder bya ratchet 31 which is first punched from sheet metal and then forced upon the knurled portion of the arbor 26 against the collet 29. The gear 25 carries a pivoted pawl 32 (Fig. 8) which is pressed against the teeth-on the ratchet 31 b a spring 33.

The alarm spring 34 and t e main gear of the alarm train are constructed and assembled on the alarm-winding arbor 35 in the same manner as the corresponding parts of the-time train illustrated in Fig. 8. The alarm train driving gear 36 (Figs. 2 and 6) is engaged bya air of pallets 37 (Fig. 2) formed on'a bo y portion 38 which is secured to a rock shaft 39 journaled in the plates 17 and 19. One end of the body portion 38 is enlarged to form a hammer head 40 thestrikin face of which is a small rotuberance 41 Formed on the eriphery o the head 40. By employing aammer having a small "striking face backed by a large mass of metal, chattering of the hammer on the gong is avoided. The other end of the bod portion 38 is provided with a tail 42 which is normally engaged by a trip lever (Fig. 2). The trip lever is composed of two pieces of spring metal one of the plate 19 and the other one of which, the piece 45, is secured at one end to the piece 44. The piece 44 is normally bent to press a ainst a strip 46 (Figs. 6 and 7) provided at its 0 posite ends with holes through which pass t e setwhich, the piece 44,

ting rod 47 and a stud48 staked to the plate 19. The strip 46 is pressed by the piece 44against the hub of the alarm-setting wheel 48 which is one of the wheels of the time train.

Normally the hub of the wheel 48 presses the trip lever into gasition to hold the alarm train stationary. hen the set 49 (Fig. 2) drops off the ledge on the usual verge on the wheel 48 the trip lever is free to move away from the tail 42 and thus release the alarm train to sound the alarm.

In order to stop the ringing of the alarm and at the same time relieve the time train of the drag of the trip lever the plates 17 and 19 carry a rock shaft 50 (Fig. 2) to which a shut-oil lever 51 is secured. One end of the lever 51 is positioned to engage the trip lever between its point of connection with the plate 19 and its point of application of pressure to the wheel 48. The other end of the lever 51 is positioned outside the casing in convenient position for manipulation. This construction provides a one-piece shut-off lever which is secured to a rock shaft to permit its movement with a minimum of friction and which effectively shuts off the alarm and relieves the time train of the drag of the trip lever during the travel of the alarm-set up the slope on the verge.

In order to ring the alarm in case of fire or other increase in temperature the plate 17 carries a pair of posts 52 which support a perforated plate 53 having a temperatureindicating dial thereon (Fig. 4). The plate 53 has a central opening which loosel receives the threaded end of a shank 54 Fig. 6) on a thermostat 55. The thermostat 13 secured to the plate 53 by a nut 56 fitted on the shank 54. The thermostat comprises a pair of corrugated disks 57 joined at their peripheral edges. "The fluid for expanding and contracting the thermostat under changes of temperature is ether which is inserted into the thermostat through a central opening in the shank 54. The thermostat is sealed by a screw 58 which is soldered into place after closing the opening in the shank 54.

The thermostat carries a boss 59 which engages a bar 60 which is secured at one end to a pin 61 journaled in ears 62 formed on a bracket 63 secured to the plate 17. The other end of the bar 60 engages one end of a rod 64 loosely mounted in the plates 17 and 19. The other end of the rod 64 passes through a hole in the piece 44 in position to engage the piece 45 and release it from the tail 52 when the thermostat expands under the influence of heat.

In order to set the thermostat to sound the alarm at a predetermined tem erature a centipede spring 65 is interpose between the thermostat and the support 53. When The thermostat 1s held from rotation when the nut 56 is turned by the spring 65 one foot of which is anchored to the support and the body portion of which has a rectangular opening embracing a rectangular portion on the shank 54.

To indicate the temperature at which the i alarm will sound the nut 56 carries a pointer 66 (Figs. 4 and.6) which travels over the dial on the support when the nut is turned.

It is highly desirable in a fire alarm clock that the alarm be sounded in case of fire even when the alarm spring 34 is no longer effective to sound the alarm when the trip lever is released by the time train. To this end the winding arbor 35 carries a pinion 67 which meshes with a gear 68 journaled on the stud 48.- When the arbor 35 turns under the influence of the uncoiling spring 34 the connections from the thermostat.

As well known to those skilled in the art an oscillating balance wheel operates as a suction pum to suck dust into the escapement through t e regulating slot (Fig. 4). In order to prevent dust entering through the slot 7 O the clock illustrated in the drawlngs is provided with a dust guard 71. The ard 71 is provided with an elongated slot 72 which loosely embraces a pin 73 on the casing. The hair spring regulator 16 extends through the guard 71 1nto the slot 70. With this construction the hair 3 ring regulator may be shifted in the slot 0 in the usual.

manner without danger of dust entering the clock through the regulating slot.

It will'be apparent from an inspection of Fig. 2 that the-plates 1 and 2 are cuttings from the main plates 17 and 19.

It will be apparent to those skilled in the art with the various features of the present invention in view, that changes may be made in the details of structure the described and illustrated embodiment thereof bein intendedas an exploitation of its under ying essentials, the features whereof will be definitely stated intheir true scope in the claims hereto appended.

What is claimed as new, is

1. An alarm clock, having, in combination, mechanism for ringing the alarm at a predetermined time, mechanism for ringing the alarm at a predetermined temperature, and automatic means for rendering the timecontrolled mechanism inoperative Without affecting the operation of the heat-controlled mechanism, substantially as described.

2. An alarm clock, having, in combination, an alarmtrain, mechanism for releasing the alarm train at a predetermined time, mechanism for releasing the alarm train at a predetermined temperature, and automatic means for preventing the release of the alarm train by the time-controlled mechanism without affecting the operation of the heat-controlled mechanism, substantially as described.

3. An alarm clock, having, in combination, an alarm mechanism, a compound trip lever for stopping the alarm mechanism comprising a pair of spring arms,-a timing mechanism for operating the trip lever to release the alarm mechanism, and an additional mechanism for operating one of the arms of the trip lever independently of the other arm to release the alarm mechanism, substantially as described.

4. An alarm clock, having, in combination, an alarm mechanism, a compound trip lever for stopping the alarm mechanism comprising a pair of spring arms, a timing mechanism for operating the trip lever to release the alarm mechanism and mechanism other than time-controlled mechanism for operating one of the arms of the trip lever independently of the other arm to release the alarm mechanism, substantially as described.

5. An alarm clock, having, in combination, an alarm mechanism, a compound trip lever for stopping the alarm mechanism compris ing a pair of spring arms, a timing mechanism for operating the trip lever to release the alarm mechanism, and heat-controlled mechanism for operating one of the arms of the trip lever independently of the other arm to release the alarm mechanism, substantially as described.

6. An alarm clock, having, in combination, stored power for ringing the alarm, time and heat controlled mechanisms for releasing the power to sound the alarm, and means for reserving a portion of the stored power to sound the alarm exclusively under the control of the heat-controlled mechanism, substantially as described.

7. An alarm clock, having, in combination,

'aooiled spring for ringing the alarm, time and heat controlled mechanisms for releasing the spring to sound the alarm, and means for preventing the exhaustion of the power 7 in the coiled spring under the control of the time-controlled mechanism, substantially as described.

8. An alarm clock, having, in combination, a coiled spring for ringing the alarm; a winding arbor therefor; a trip lever for shutting off the alarm; a setting arbor passing loosely through the trip lever; and mechanism for operating the-trip lever to shut off the alarm comprising a pinion on the winding arbor, a gear wheel driven therefrom, a stud for the gear wheel, a second tri lever having holes therein through which the setting arbor and gear wheel stud pass, and means on the gear wheel for operating the second trip lever to press upon the first trip lever, substantially as described.

9. In a clock, the combination of a thermostat, a support therefor, a threaded shank on the thermostat passing loosely through the support, adjusting means on the shank for drawing the thermostat toward the su port, and a spring interposed between t e thermostat and support for movin the thermostat away from the support, su stantially as described.

10. In a clock, the combination of a thermostat, a support therefor, a threaded shank on the thermostat passing loosely through the support and having a rectangular portion, a thumb nut on the shank for drawing the thermostat toward the support, and a centipede spring interposed between the thermostat and support with the feet thereon engaged with the support and with the body portion of the s ring fitted over the rectangular portion 0 the shank, substantially as described.

- JOHN S. HARTLEY. 

